<template>
  <div>
    <span v-for="(item,idx) in arr" :key="idx">
      <input type="checkbox" v-model="isCheckbox" :value="item">{{item}}
    </span>
    <p>你选中的元素,累加的值和为:{{sum}}</p>
  </div>
</template>
<script>
export default {
  data() {
    return {
      arr:[9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      isCheckbox:[]
    }
  },
  computed:{
      sum(){
       return this.isCheckbox.reduce((sum,item)=>sum+=item,0)
      }
  }
}
</script>